Weoften use 'yet' in negative Present Perfect sentences. Jim hasn'tphoned me yet. I've been waiting since morning. I'm not ready to go. I haven't had a shower yet.; They haven't danced together for 2 years.; Questions in Present Perfect. We use Present Perfect tense to ask and answer questions about actions or events in the past that still have an effect on the present moment.
Thesimple present and simple past tenses of to be are also used as auxiliary verbs to create the present continuous and past continuous tenses, which show an ongoing or continuous action.. As with other tenses, in the continuous tenses, to be verbs are still conjugated to match the subject. The main verb of the sentence comes after to be and is always in its present participle form (theThepresent perfect tense is indeed simple and easy if you try to understand and use it the right way. It seems to be confusing to some though the tense has a very simple structure. The structure of the present perfect tense can be analysed with reference to positive, negative, interrogative and negative interrogative types of sentencesdFJVej.